Error with simple Application

[nam508]

This is a my program.

import javabook.*;
class MyFirstApplication
{
public static void main(String args[])
{
MainWindow mainWindow;
mainWindow= new MainWindow();
mainWindow.show();
}
}
When I complie it with message error:
C:\>javac MyFirstApplication.java
MyFirstApplication.java:1: package javabook does not exist
import javabook.*;
^
MyFirstApplication.java:6: cannot resolve symbol
symbol : class MainWindow
location: class MyFirstApplication
MainWindow mainWindow;
^
MyFirstApplication.java:7: cannot resolve symbol
symbol : class MainWindow
location: class MyFirstApplication
mainWindow= new MainWindow();
^
3 errors
Who help me to repair this program. Thanks

[Norm]

Looks like you need to tell the compiler where the javabook package is located.This is done by the classpath option on the javac command or you can set the CLASSPATH global environment variable.